Startup clanking sound and with ac on sometimes

Two days ago my car started making a bad clanking / rattling / chattering sound right when I start it for about 1-2 seconds and goes away. This happens every time, not just when cold. It also happens sometimes when i turn the ac on. Its a knocking noise like if you were to put a bolt in the dryer with clothes and turned it on. Tumbling intermittent knock.

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